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• Inputting files in different folders as arguments to ffmpeg in Python

  20 janvier 2016, par John Stanford

  I’m working on a program using ffmpeg in Python and I’m trying to stack a bunch of PNG images into a video. I want to keep the code on my Dropbox but use the local hard drive to do the work, so I when I input the files as arguments, I want to include the directory. The code below makes the raw input file just fine, but when I try to begin a pipe with ffmpeg, it tells me it can’t find the input file. Is there some special way to format this if the input file is in a different directory ? I’ve had similar code work fine with the files all located in the same folder. Thanks !

  import subprocess as sp
  
  
  
  import numpy as np
  
  import matplotlib.pyplot as plt
  
  
  
  import os
  
  import shutil
  
  
  
  import tkinter.filedialog as tkFileDialog
  
  
  
  FFMPEG_BIN = 'ffmpeg.exe'
  
  
  
  def readImages(pathToImages):
  
      filenames = os.listdir(path=pathToImages)
  
      f = open("C:\\Users\johnwstanford\Desktop\outputfile.raw", "wb")
  
  
  
      for file in filenames:
  
          print(file)
  
          image = plt.imread(pathToImages + '/' + file)
  
          image = np.delete(image, 3, 2)*255
  
  
  
          f.write(image.tobytes())
  
      f.close()
  
  
  
  readImages(tkFileDialog.askdirectory())
  
  
  
  command2 = [FFMPEG_BIN,
  
             '-y',
  
             '-f', 'rawvideo',
  
             '-vcodec', 'rawvideo',
  
             '-s', '1600x1200',
  
             '-pix_fmt', 'rgb24',
  
             '-r', '25',
  
             '-i', "C:\\Users\johnwstanford\Desktop\outputfile.raw",
  
             "C:\\Users\johnwstanford\Desktop\output.mp4"]
  
  
  
  pipe2 = sp.Popen(command2, stdin = sp.PIPE, stderr=sp.PIPE)
  
  print(pipe2.communicate()[1])
  
  pipe2.kill()
  
  os.remove("C:\\Users\johnwstanford\Desktop\outputfile.raw")

• Packet Corruption : Why sometimes ffmpeg .bat batch video editing makes my computer unstable unable to restart ?

  13 juin 2022, par principal-ideal-domain

  I'm doing very time consuming ffmpeg video editing. That's why I put my commands into a .bat batch file and run them over night. Usually that works fine, but from time to time when I look the next moring I see an error message of this kind :

  


  

  


  From that state on, I didn't find any good way to close the console. When I press the [x] button in the top right corner, it freezes. When I try to kill the application using the task manager nothing happens. Even explorer.exe cannot be closed using the task manager. A shutdown won't do anything. During the last month I had this problem about three times and the only way I could close it was to long press the power button of the computer until it was turned off "the bad way".

  


  Any ideas what to in such situations ?
  
Or even better : How to prevent those situations ?
What can the reason(s) be for the error ?
Do you understand the message ?

  


  When the computer is started again the next morining and I run the same .bat file again everything works fine. So the same error does not repeat and the video is edited nicely !

  


  Edit : Now, about one week after posting this question the problem occurred many more times ! It is very annoying. I guess it has to do with the external hard drive connected by USB. Sometimes it randomly interrupts the connection ! That might be the reason for the behavior. Whatever its causing the error, I want to learn a solution how to deal with this in future. I don't want to always push the reset button of my computer. I want a proper way to be able to shut it down.

  


• lavf/qtpalette : Treat 1-bit video as palettized

  29 décembre 2015, par Mats Peterson

  lavf/qtpalette : Treat 1-bit video as palettized
  This commit for qtpalette.c and qtpalette.h adds 1-bit video to the
  
  "palettized video" category, since if the video sample description
  
  contains a palette, the two colors in the palette can be any color, not
  
  necessarily black & white.
  Unfortunately, I’ve noticed that the qtrle (QuickTime Animation) decoder
  
  blindly assumes that 1-bit video is black & white. I don’t have enough
  
  knowledge about the decoder to fix this, though.
  Below is a link to a sample 1-bit QuickTime Animation clip of a rotating
  
  earth that uses blueish colors, and they will be correctly rendered in
  
  QuickTime, but not in FFmpeg (which will use black & white).
  https://drive.google.com/open?id=0B3_pEBoLs0faUlItWm9KaGJSTEE
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/qtpalette.c
  • [DH] libavformat/qtpalette.h